Classifications

• • C—CHEMISTRY; METALLURGY
  • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
  • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
  • C23C20/00—Chemical coating by decomposition of either solid compounds or suspensions of the coating forming compounds, without leaving reaction products of surface material in the coating
  • C23C20/06—Coating with inorganic material, other than metallic material
  • C23C20/08—Coating with inorganic material, other than metallic material with compounds, mixtures or solid solutions, e.g. borides, carbides, nitrides
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
  • B01J21/00—Catalysts comprising the elements, oxides, or hydroxides of magnesium, boron, aluminium, carbon, silicon, titanium, zirconium, or hafnium
  • B01J21/06—Silicon, titanium, zirconium or hafnium; Oxides or hydroxides thereof
  • B01J21/063—Titanium; Oxides or hydroxides thereof
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B22—CASTING; POWDER METALLURGY
  • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
  • B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
  • B22F1/18—Non-metallic particles coated with metal
• • C—CHEMISTRY; METALLURGY
  • C01—INORGANIC CHEMISTRY
  • C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
  • C01F11/00—Compounds of calcium, strontium, or barium
  • C01F11/18—Carbonates
  • C01F11/185—After-treatment, e.g. grinding, purification, conversion of crystal morphology
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK  ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
  • C09C1/00—Treatment of specific inorganic materials other than fibrous fillers; Preparation of carbon black
  • C09C1/02—Compounds of alkaline earth metals or magnesium
  • C09C1/021—Calcium carbonates
  • C09C1/022—Treatment with inorganic compounds
  • C09C1/024—Coating
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK  ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
  • C09C3/00—Treatment in general of inorganic materials, other than fibrous fillers, to enhance their pigmenting or filling properties
  • C09C3/06—Treatment with inorganic compounds
  • C09C3/063—Coating
• • C—CHEMISTRY; METALLURGY
  • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
  • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
  • C23C18/00—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating
• • C—CHEMISTRY; METALLURGY
  • C01—INORGANIC CHEMISTRY
  • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
  • C01P2002/00—Crystal-structural characteristics
  • C01P2002/80—Crystal-structural characteristics defined by measured data other than those specified in group C01P2002/70
  • C01P2002/84—Crystal-structural characteristics defined by measured data other than those specified in group C01P2002/70 by UV- or VIS- data
• • C—CHEMISTRY; METALLURGY
  • C01—INORGANIC CHEMISTRY
  • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
  • C01P2004/00—Particle morphology
  • C01P2004/80—Particles consisting of a mixture of two or more inorganic phases
  • C01P2004/82—Particles consisting of a mixture of two or more inorganic phases two phases having the same anion, e.g. both oxidic phases
  • C01P2004/84—Particles consisting of a mixture of two or more inorganic phases two phases having the same anion, e.g. both oxidic phases one phase coated with the other
  • C01P2004/86—Thin layer coatings, i.e. the coating thickness being less than 0.1 time the particle radius
• • C—CHEMISTRY; METALLURGY
  • C01—INORGANIC CHEMISTRY
  • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
  • C01P2006/00—Physical properties of inorganic compounds
  • C01P2006/42—Magnetic properties
• • C—CHEMISTRY; METALLURGY
  • C01—INORGANIC CHEMISTRY
  • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
  • C01P2006/00—Physical properties of inorganic compounds
  • C01P2006/60—Optical properties, e.g. expressed in CIELAB-values
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T428/00—Stock material or miscellaneous articles
  • Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
  • Y10T428/2982—Particulate matter [e.g., sphere, flake, etc.]
  • Y10T428/2991—Coated
  • Y10T428/2993—Silicic or refractory material containing [e.g., tungsten oxide, glass, cement, etc.]

Definitions

• Patent application title Powder coated with titanium film and method for producing the same
• the present invention relates to a titania film-coated powder and a method for producing the same.
• the present invention relates to a photocatalyst powder, a blue or reddish purple colored ink, a pigment powder for color toner, a plastic, a filler powder for paper, and a cosmetic.
• TECHNICAL FIELD The present invention relates to a titania film-coated powder that can be used for various purposes such as powders for materials and a method for producing the same.
• the present inventors have proposed a method of coating a titania film on base particles such as iron powder by coating a liquid-phase titania (hereinafter also referred to as titanium oxide) film by reacting hydrolysis of metal alkoxide.
• a method for coating a liquid phase titanium oxide film by a neutralization hydrolysis reaction of a metal salt using a titanyl sulfate solution Japanese Unexamined Patent Publication No. 2000-345) 072 No. 2
• Japanese Unexamined Patent Publication No. 2000-3405 Japanese Unexamined Patent Publication No. 2000-345) 072 No. 2
• a method of coating a liquid-phase titanium oxide film by a thermal hydrolysis reaction of a metal salt using a titanium (IV) chloride solution has been disclosed (Japanese Patent Application Laid-Open No. 5-268738, etc.).
• the substrate suspension becomes acidic at the beginning or end of the reaction, and the liquid-phase titanium oxide film is formed by a thermal hydrolysis reaction of the metal salt.
• the substrate suspension becomes hot and acidic.
• the present invention is intended to overcome the above-mentioned drawbacks of the conventional technology, and it is easy to apply iron powder or the like, which is safe, low in cost, and easily corrodes in acid, as a base. It is intended to provide a titania film-coated powder and a method for producing the same.
• the present invention is as follows.
• the base particles are suspended in a buffer having a pH of 7.0 to 12.0 to form a suspension, which contains peroxotitanic acid.
• a mixed solution of hydrogen peroxide and ammonia into the suspension, the titania deposition reaction due to the decomposition of the peroxotitanic acid was controlled in the suspension to confirm that the titania film was coated on the base particles. Characterized titania film-coated powder.
• the base particles are suspended in a buffer having a pH of 7.0 to 12.0 to form a suspension.
• the Peroki By dropping a hydrogen peroxide-ammonia mixture containing sotitanic acid into the suspension, titania precipitation reaction due to decomposition of the peroxotitanic acid in the suspension is controlled, and titania is deposited on the base particles.
• the titania film-coated powder and the method for producing the same according to the present invention maintain the base particle suspension at a pH of 7.0 to 12.0 at a neutral or weak alkalinity, thereby obtaining a 5 to 5
• the film formation reaction can be performed at a normal temperature of 0 ° C. Even when iron powder or the like which is easily corroded in an acid is used as a substrate, the film coating can be performed without deteriorating the substrate. It is something that can be done.
• titania film-coated powder of the present invention can be produced by a method for producing the same. Applicable even if dissolved in BRIEF DESCRIPTION OF THE FIGURES
• FIG. 1 is a diagram showing a spectral reflection curve of the titania film-coated perm mouth powder obtained in Example 1.
• FIG. 2 is a diagram showing a spectral reflection curve of the titania film-coated iron powder obtained in Example 2.
• FIG. 3 is a view showing a spectral reflection curve of a permalloy powder coated with a silica-titania two-layer film obtained in Example 3.
• the substrate particles used in the production of the titer film-coated powder of the present invention include
• the material is not limited thereto, but may be an inorganic material containing a metal, an organic material, a magnetic material, a dielectric material, a conductor, an insulator, or the like.
• the base is a metal
• any metal such as iron, nickel, chromium, titanium, and aluminum may be used, but when using the magnetism, a magnetic material such as iron is preferable.
• These metals may be alloys. When these metals have the above-mentioned magnetism, it is preferable to use ferromagnetic alloys.
• the base of the powder is a metal compound, typical examples thereof include oxides of the above-mentioned metals.
• metal compounds other than metal oxides include metal nitrides, metal carbides, metal sulfides, metal fluorides, metal carbonates, metal phosphates, and the like.
• the base particles other than metals, they are semi-metallic and non-metallic compounds, particularly oxides, carbides and nitrides, and silica, glass beads and the like can be used.
• Other inorganic substances include inorganic hollow particles such as shirasu balloons (hollow silicate particles), fine carbon hollow spheres (tarecsphere), fused alumina bubbles, aerosil, white carbon, silica fine hollow spheres, and carbonic acid.
• Calcium micro hollow spheres, calcium carbonate, perlite, talc, bentonite, synthetic mica, muscovite such as muscovite, kaolin and the like can be used.
• resin particles are preferable.
• resin particles include cellulose powder, cellulose acetate powder, polyamide, epoxy resin, polyester, melamine resin, polyurethane, vinyl acetate resin, silicone resin, acrylate ester, Spherical or crushed particles obtained by polymerization or copolymerization of metaacrylic acid ester, styrene, ethylene, propylene and their derivatives.
• Particularly preferred resin particles are spherical acrylic resin particles obtained by polymerization of acrylic acid or methacrylic acid ester.
• the shape of the tomb is a polyhedron such as a sphere, a subsphere, a regular polyhedron, etc., a rectangular parallelepiped, a spheroid, a rhombohedron, a plate, a needle (a cylinder, a prism), etc. Crushed material Such completely amorphous powders can also be used.
• the size of these substrates is not particularly limited, but is preferably in the range of 0.01 / X m to several mm.
• the buffer for suspending the substrate particles used in the production of the titania film-coated powder of the present invention may be neutral or weakly alkaline, having a pH of 7.0 to 12.0.
• specific examples include Tris, boric acid, borate, phosphoric acid, phosphate, glycine, carbonate, and the like.
• the mixed solution of hydrogen peroxide and ammonia containing peroxotitanic acid used in the production of the titania film-coated powder of the present invention is not particularly limited, but has a higher pH than that of the buffer for suspending the base particles. Things are preferred.
• the method for preparing the mixed solution is not particularly limited, but includes the following methods.
• the valence of Ti of the titanium source used in the method may be not only tetravalent but also trivalent.
• titanium chloride [III] can be used.
• Beloxotitanic acid such as “New TASF ine” (trade name, manufactured by Furuchi Chemical Co., Ltd.) or “PTA solution” (trade name, manufactured by Tanaka Transcription Co., Ltd.)
• a hydrogen peroxide-ammonia mixed solution containing peroxotitanic acid is dropped into a suspension in which the base particles are suspended, and a titania precipitation reaction is caused by decomposition of peroxotitanic acid.
• the reaction temperature for the reaction is not particularly limited.
• an advantage of the present invention is that the suspension of the substrate particles is maintained at a neutral or weak pH of 7.0 to 12.0 at a room temperature of 5 to 50.
• a film formation reaction can be performed.
• the titanium oxide formed by a decomposition reaction of a peroxotitanium complex is formed.
• the tan film may be a transparent film, and may be combined with another transparent metal hydroxide film or metal oxide film to form a plurality of layers.
• a special function can be provided by adjusting the thickness of each of the plurality of coating films (layers of the film that cover the base particles and can participate in light interference).
• the above-mentioned titania film or other material film is multi-layer coated to form an optical interference multilayer thin film, and the wavelength-selective light reflection allows the powder to have a desired color without using pigments or dyes.
• the system can be colored vividly.
• selecting the materials of the base particles and the respective coating layers naturally specifies their complex refractive indexes.
• the specification of the complex refractive index of the base particles and each coating layer is involved in calculating the Fresnel reflection coefficient and the amplitude reflection intensity between each layer.
• correction may be required depending on the particle shape described below.
• the curvatures of the substrate particles and the multilayer film are specified. If the curvature is not specified, it will be difficult to correct the film thickness monitoring spectral photometric characteristic described later. .
• Multilayer reflection intensity R f lat in the case of group particles are plate members in advance
• Material of the selected base particles complex index of refraction
• the coating layer number the coating order of the coating layers
• material of each coating layer The complex refractive index
• r Fresnel reflection coefficient at the interface between the j-th layer from the bottom and the layer immediately above it j
• j-i the amplitude reflection intensity between the first layer from the j-th layer below and the layer immediately above it
• n j complex refractive index of the ⁇ th layer from the bottom
• d j thickness of the j-th layer from the bottom
• Equation 2 (Where ⁇ is the angle of incidence on the outermost layer), and the method is performed by determining the film thickness of each coating layer so that the R ( ⁇ ) value becomes the maximum value or the minimum value at the desired wavelength. Is preferred. Applying the R flat value to Equation 2 means that the angle distribution of the light incident angle on the multilayer coated powder is approximated to the light incident angle distribution on one coated hemisphere.
• each coating film is formed on the base particles so as to have the thickness determined as described above.
• the substrate is a powder
• the relationship between the maximum or minimum measured value of the reflected wavelength and the film thickness is disturbed by the curvature of each coating layer, which depends on the particle shape and particle diameter, and the spectrophotometer If the film is formed so that the maximum or minimum reflection wavelength measured in the step becomes a desired value, there arises a problem that the finally obtained multilayer-coated powder does not have a desired reflection intensity at a desired wavelength. . For this reason, it is necessary to perform correction based on the curvature of each coating layer, which depends on the shape and particle diameter of the base particles.
• the method of this capture is not particularly limited, but each of the coating layers selected on the selected base particles is coated in several steps with different thicknesses to obtain a film coating powder for particle size correction.
• the actual thickness value (d M) were measured for each coating layer of the particle diameter correction for film-coated powder, also for measurement and each of the particle size corrected by spectrophotometer each membrane the Kutsugaekonatai
• the optical thickness (nd) of each coating layer of the film-coated powder is determined, and the product of the actual film thickness value of each coating layer of the film-coating powder for each particle diameter and the real term (n) of the complex refractive index is obtained.
• the actual film thickness (dM) of each coating layer of the above-mentioned particle coating film was measured.
• the method is not particularly limited, but is preferably performed by cutting each of the particle-size-correcting film-coated powders and measuring from the cut surface. Further, when cutting the particle coating powder for particle diameter correction, focused ion beam (FIB) processing is performed so that the cut surface becomes clear, and the actual film thickness value ( d M ) is suitable for measurement.
• FIB focused ion beam
• equation 3 can be used.
• ⁇ is the real term of the complex refractive index of the single-layer film
• k is the interference order, or is the peak or valley wavelength.
• Example 1 Preparation of titania film-coated permalloy powder
• a solution a mixed solution of 0.4 mol / liter of liuumaric acid (hereinafter referred to as A solution) was obtained.
• the solution A (200 g) and the solution B (80 g) were mixed to prepare a tobacco particle suspension buffer.
• the pH of the substrate particle suspension buffer was 9.1.
• a flaky permalloy powder having an average particle size of 17.4 ⁇ was used.
• 30 g of Fukuda Foil Flour Industry Co., Ltd., trade name (78 perm mouth break) was suspended to obtain a base particle suspension buffer.
• the whole amount of the dropping solution was dropped at a supply rate of 1.5 m 1 / min, and the mixture was aged for 2 hours.
• titania was precipitated from the peroxotitanic acid in the liquid on the surface of the substrate particles, and the substrate particles were coated with the titania film.
• the stirring was stopped, and the powder in the suspension was allowed to settle to stand still, and the upper liquid was removed.
• the upper solution was colorless and transparent.
• Table 1 shows the suspension amount of the base particles and the composition of the dropping liquid for samples 1 to 6.
• Table 1 Suspension amount of base particles and composition of dripping liquid
• Fig. 1 shows the spectral reflectance curve obtained by measuring with an ultraviolet / visible / near infrared spectrophotometer (manufactured by JASCO Corporation, I LN-472 type with integrating sphere-570 type).
• the peak of the curve in Fig. 1 the film thickness calculated from the bottom wavelength (assuming that the real term of the complex refractive index of the non-heat-treated titania film is 2.0), and the magnetization at an applied magnetic field of 1 kOe See Table 2.
• the magnetization at an applied magnetic field of 1 kOe was measured by a vibrating sample magnetometer (TM-VSM1014-MRO-N, manufactured by Tamagawa Seisakusho).
• the whole amount of the dropping solution was dropped at a supply rate of 1.5 ml / min, and the mixture was aged for 2 hours.
• the deposition of titania from the peroxotitanic acid in the liquid occurred on the surface of the substrate particles, and the substrate particles were coated with a titer film.
• the stirring was stopped, and the powder in the suspension was allowed to settle to stand still, and the upper liquid was removed.
• the upper solution was colorless and transparent.
• Table 3 shows the composition of the dripping solution for samples 1 to 3.
• Table 3 Composition of dripping liquid
• Fig. 2 shows the spectral reflectance curve obtained by measuring with an ultraviolet / visible Z near infrared spectrophotometer (manufactured by JASCO Corporation, I L N-472 with an integrating sphere-570).
• Table 4 shows the peak of the curve in Fig. 2, the film thickness calculated from the bottom wavelength (assuming the real term of the complex refractive index of the unheated titania film is 2.0), and the magnetization at an applied magnetic field of 1 kOe. Show.
• the magnetization at an applied magnetic field of 1 kOe was measured using a vibrating sample magnetometer (TM-VSM 1014-1 MR O-N, manufactured by Tamagawa Seisakusho).
• Example 2 In the buffer for suspending substrate particles obtained in Example 1 described above, 40 g of the flaky permalloy powder used in Example 1 was suspended to obtain a substrate particle suspension buffer. Silicon film coating
• the stirring was stopped, and the powder in the suspension was allowed to settle to stand still, and the upper liquid was removed.
• the upper solution was colorless and transparent.
• drying was performed at 120 ° C. for 2 hours to obtain a perm powder coated with a silicon film.
• the whole amount of the dropping solution for titania film coating was dropped at a supply rate of 1.5 m 1 / min, followed by aging for 2 hours.
• the deposition of titania from the peroxotitanic acid in the liquid occurred on the surface of the powder coated with the silica film, and the titania film was coated on the powder coated with the silicon film.
• the stirring was stopped, and the powder in the suspension was allowed to settle to stand still, and the upper liquid was removed.
• the upper solution was colorless and transparent.
• Table 5 shows the compositions of the dropping solutions for titania film coating for samples 1 to 4.
• Fig. 3 shows the spectral reflectance curve obtained by measurement with an ultraviolet / visible / near-infrared spectrophotometer (manufactured by JASCO Corporation, model IL-472 with an integrating sphere, model V-570).
• the complex refractive index of Permalloy is the same as that of nickel, 2.1 — 4. O i, the real term of the complex refractive index of the unheated silica film is 1.5, and the real term of the complex refractive index of the unheated titania film is 2.0.
• the film thickness was calculated by carp-fitting the curve in the above figure against the calculated value of the spectral reflection curve based on the assumed Fresnel theory. Table 6 shows the calculated film thickness and the magnetization at an applied magnetic field of 1 kOe. The magnetization at an applied magnetic field of 1 kOe was measured using a vibrating sample magnetometer (TM-VSM1014-MRO-N, manufactured by Tamagawa Seisakusho). Table 6 Film thickness calculated from peak and bottom wavelengths of spectral reflection curve
• the lightness L * was 9.6.74 (manufactured by JASCO Corporation, ILN-472 type V-570 type with an integrating sphere V-570 / 10 g of heavy calcium carbonate powder (manufactured by Nittetsu Mining Co., Ltd., trade name: Tankal F # 300), which is a visible / near-infrared spectrophotometer, is suspended, and the base particle suspension buffer is added. Obtained. Preparation of dripping liquid
• the whole amount of the dropping solution was dropped at a supply rate of 1.5 ml / min, and the mixture was aged for 2 hours.
• titania was precipitated from the peroxotitanic acid in the liquid on the surface of the substrate particles, and the substrate particles were coated with the titania film.
• the stirring was stopped, and the powder in the suspension was allowed to settle to stand still, and the upper liquid was removed.
• the upper solution was colorless and transparent.
• the coating amount of the titanium film was 1 ° wt%, and was measured with an ultraviolet / visible / near-infrared spectrophotometer (manufactured by JASCO Corporation, ILN-472 type V-570 with integrating sphere).
• the obtained lightness L * was 97.65.
• the titania film-coated powder of the present invention and the method for producing the same are characterized in that the suspension of the base particles is maintained at a pH of 7.0 to 12.0 at a neutral or weak alkalinity, so that the suspension has a pH of 5 to 50.
• a film forming reaction can be performed at room temperature of ° C. Even when iron powder or the like which is easily corroded in an acid is used as a substrate, the film is coated without deteriorating the substrate. You can do it.
• the method for producing the titania film-coated powder of the present invention is not limited to the use of an iron powder or the like which is easily corroded in an acid, as well as an acid having a pH of 5 or less, such as calcium carbonate, as the base particles. Applicable even if dissolved under the conditions.

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